ECTS OF CHANGES OF BIRTH AND DEATH RATES 655 TABLE 3 Analysis of Effects of Mortality and Fertility in the Differences between Honduras 1966 and Sweden 1798-1802 )rtality Honduras 1966 Honduras 1966 Sweden 1798-1802 Sweden 1798-1802 utility Honduras 1966 Sweden Honduras 1798-1802 1966 Sweden 1798-1802 Dr 35.63 17.08 21.67 4.30 ;nt under ge 15 47.37 34.45 41.75 29.71 i age 20.95 27.62 23.38 30.03 Average Effects of Mortality Fertility Interaction )r 13.37 17.96 1.18 ;nt under ge 15 5.18 12.48 0.88 lage -2.42 -6.66 -0.02 ource: Author's calculations. y superior at young ages; and that the difference in fertility rates acts more strongly in the same direction, lowering the mean age by 6.66 s. his first method of decomposition of parameters of age distribution pro-5 numbers but no mathematical analysis. 'he Study of Linkages. The second way of answering the question of how iging birth or death rates affect ages is through studying theoretically the iges in the stable model. This method has the advantage that it provides nderstanding of the mechanism of linkage; it enables us to study all kinds ossible changes, not only those that historically occurred in the past. The r part of this paper will serve to introduce the main ideas in a relatively :echnical way. Our linkages are a way of tracing the demographic con-ences of possible policies. y Options he birth and death rates with which the present-day demographer dealstality of Honduras 1966 and the fertility of Sweden 1800 are the second column; the difference between the first two numbers in any row tells us the pure effect of fertility under Honduran mortality. This may be averaged with the difference of the last two numbers, which tells us the fertility effect under Swedish mortality.